NiFe2O4-Ba0.7Ca0.3TiO3 纳米复合材料的多铁特性

IF 1.7 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Advances in Natural Sciences: Nanoscience and Nanotechnology Pub Date : 2024-08-16 DOI:10.1088/2043-6262/ad6b7c
Tran Thi Ha Giang, Nguyen Thi Viet Chinh, Dao Son Lam, Dinh Chi Linh, Pham Hong Nam, Ta Ngoc Bach, Nguyen The Long, Do Hung Manh, Dang Duc Dung, Huynh Ngoc Toan, N N Poddubnaya, Tran Dang Thanh
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引用次数: 0

摘要

在本报告中,我们介绍了通过高能球磨、热处理和火花等离子烧结技术组合制备的四种镍铁氧体-钡0.7Ca0.3TiO3(NFO/BCTO)纳米复合材料样品的多铁特性研究结果。结构分析表明,这些样品同时含有纳米级 NiFe2O4(NFO)和 Ba0.7Ca0.3TiO3(BCTO)晶体两相。与纯 BCTO 相比,在 BCTO 主晶中添加 NFO 不会改变晶体结构,但却能显著改善多铁性特性。此外,还研究了饱和磁化(Ms)和矫顽力(Hc)随温度变化的情况。结果表明,Ms 随 NFO 浓度的增加而逐渐增大。在温度依赖性方面,Ms(T) 数据偏离布洛赫定律,指数系数 α 在 1.8-1.9 范围内变化,随着 NFO 浓度的增加而逐渐减小。同时,Hc 随 NFO 浓度的增加而逐渐减小,在温度依赖性方面遵循 Kneller 定律。
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Multiferroic properties of NiFe2O4-Ba0.7Ca0.3TiO3 nanocomposites
In this report, we present results on the multiferroic properties of four nanocomposite samples of NiFe2O4-Ba0.7Ca0.3TiO3 (NFO/BCTO), which were fabricated through combinations of high-energy ball milling, heat treatment, and spark plasma sintering techniques. Structural analyses revealed that these samples simultaneously contain two phases of nano-sized NiFe2O4 (NFO) and Ba0.7Ca0.3TiO3 (BCTO) crystals. The addition of NFO into the BCTO-host did not alter the crystal structure but significantly improved the multiferroic characteristics compared to pure BCTO. Furthermore, variations in saturation magnetization (M s) and coercivity (H c) were investigated as a function of temperature. The results showed that Ms increased gradually with the concentration of NFO. In terms of temperature dependence, M s(T) data deviated from the Bloch’s law with an exponent coefficient α changing in the range of 1.8–1.9, decreasing gradually as the NFO concentration increased. Meanwhile, H c decreased gradually as the NFO concentration increased and followed the Kneller’s law in terms of temperature dependence.
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Advances in Natural Sciences: Nanoscience and Nanotechnology
Advances in Natural Sciences: Nanoscience and Nanotechnology NANOSCIENCE & NANOTECHNOLOGYMATERIALS SCIE-MATERIALS SCIENCE, MULTIDISCIPLINARY
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